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A model of the evaporation of binary-fuel clusters of dropsA formulation has been developed to describe the evaporation of dense or dilute clusters of binary-fuel drops. The binary fuel is assumed to be made of a solute and a solvent whose volatility is much lower than that of the solute. Convective flow effects, inducing a circulatory motion inside the drops, are taken into account, as well as turbulence external to the cluster volume. Results obtained with this model show that, similar to the conclusions for single isolated drops, the evaporation of the volatile is controlled by liquid mass diffusion when the cluster is dilute. In contrast, when the cluster is dense, the evaporation of the volatile is controlled by surface layer stripping, that is, by the regression rate of the drop, which is in fact controlled by the evaporation rate of the solvent. These conclusions are in agreement with existing experimental observations. Parametric studies show that these conclusions remain valid with changes in ambient temperature, initial slip velocity between drops and gas, initial drop size, initial cluster size, initial liquid mass fraction of the solute, and various combinations of solvent and solute. The implications of these results for computationally intensive combustor calculations are discussed.
Document ID
19930068600
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Harstad, K.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Bellan, J.
(JPL Pasadena, CA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Atomization and Sprays
ISSN: 1044-5110
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
93A52597
Distribution Limits
Public
Copyright
Other

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